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  <title>检查类的方法是否存在</title>
 </head>
 <body class="docs"><div id="layout">
  <div id="layout-content"><div id="function.method-exists" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">method_exists</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">method_exists</span> &mdash; <span class="dc-title">检查类的方法是否存在</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.method-exists-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>method_exists</strong></span>
    ( <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$object</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$method_name</code></span>
   ) : <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   检查类的方法是否存在于指定的 <code class="parameter">object</code>中。
  </p>
 </div>

 
 <div class="refsect1 parameters" id="refsect1-function.method-exists-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">object</code></dt>

     <dd>

      <p class="para">
       对象示例或者类名。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">method_name</code></dt>

     <dd>

      <p class="para">
       方法名。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.method-exists-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">   
   如果 <code class="parameter">method_name</code>
   所指的方法在 <code class="parameter">object</code>
   所指的对象类中已定义，则返回 <strong><code>TRUE</code></strong>，否则返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 notes" id="refsect1-function.method-exists-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: <p class="para">如果此类不是已知类，使用此函数会使用任何已注册的
<a href="language.oop5.autoload.html" class="link">autoloader</a>。</p></p></blockquote>
 </div>


 <div class="refsect1 examples" id="refsect1-function.method-exists-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-6151">
    <p><strong>Example #1 <span class="function"><strong>method_exists()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$directory&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Directory</span><span style="color: #007700">(</span><span style="color: #DD0000">'.'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">method_exists</span><span style="color: #007700">(</span><span style="color: #0000BB">$directory</span><span style="color: #007700">,</span><span style="color: #DD0000">'read'</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
bool(true)
</pre></div>
    </div>
   </div>
   <div class="example" id="example-6152">
    <p><strong>Example #2 Static <span class="function"><strong>method_exists()</strong></span>  例子
    </strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">method_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">'Directory'</span><span style="color: #007700">,</span><span style="color: #DD0000">'read'</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
bool(true)
</pre></div>
    </div>
   </div>
  </p>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.method-exists-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function_exists.html" class="function" rel="rdfs-seeAlso">function_exists()</a> - 如果给定的函数已经被定义就返回 TRUE</span></li>
    <li class="member"><span class="function"><a href="is_callable.html" class="function" rel="rdfs-seeAlso">is_callable()</a> - 检测参数是否为合法的可调用结构</span></li>
    <li class="member"><span class="function"><a href="class_exists.html" class="function" rel="rdfs-seeAlso">class_exists()</a> - 检查类是否已定义</span></li>
   </ul>
  </p>
 </div>

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